Why is that?

One can get into the same "trouble" by doing a "sudo bash" and
running as root.

One thing I find troublesome with most Linux distros is the fact
one can shutdown the system as a user using a desktop GUI. As a
for-example of one system that controls shutdown properly, look
at Solaris -- one must be logged-in as root to perform a shutdown.

And here's something funny from about a decade ago: there was an
HP-UX desktop system at a client's site I was using and that system
had a power button on the front panel, lower-right corner, at the
desktop height. When using the mouse, the semi-stiff mouse cord
would hit the power button and shutdown.